""..... There has been a lot of discussion (1 2 3) on the impact of interactive whiteboards (IWB)in teaching and learning. Schools around the country (and world) are heavily investing in this technology as the newest tool for delivery of information. Many IWBs are rather fragile and while we would like to think that things are never thrown in a classroom, one errant missile can leave a "dead spot" on the surface of the IWB, reducing it's functionality. Some schools want to buy one per department or grade level, but as a former classroom teacher my experience with sharing a resource like this is usually not worth the effort.......

...Now let's look at a more technologically advanced classroom: tablet PC, wireless ceiling mounted projector, wireless interactive tablet, and associated cabling...."

I won't spoil the surprise by telling you any of his conclusions, but you may find it interesting.  It also includes some information on a special companion device called an "Interwrite Pad":

"Interwrite Learning’s Interwrite Pad was designed with the teacher in mind. This Bluetooth™ wireless pad includes Interwrite Software and gives the teacher the ability to teach their interactive lessons from anywhere in the classroom. The Interwrite Pad revolutionizes how teachers interact with their class."

I like the innovation he has shown in thinking this through.  Go check it out, and look for these solutions in a classroom near you soon!